mirror of https://github.com/ekimekim/wubloader
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134 lines
3.6 KiB
Python
134 lines
3.6 KiB
Python
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"""A place for common utilities between wubloader components"""
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# HACK: This sets the default encoding for the entire process.
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# It is possible this may break (badly-written) third party libs.
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import sys
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reload(sys)
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sys.setdefaultencoding('utf-8')
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import datetime
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import errno
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import os
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import random
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from .segments import get_best_segments, rough_cut_segments, fast_cut_segments, full_cut_segments, parse_segment_path, SegmentInfo
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from .stats import timed, PromLogCountsHandler, install_stacksampler
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def dt_to_bustime(start, dt):
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"""Convert a datetime to bus time. Bus time is seconds since the given start point."""
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return (dt - start).total_seconds()
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def bustime_to_dt(start, bustime):
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"""Convert from bus time to a datetime"""
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return start + datetime.timedelta(seconds=bustime)
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def parse_bustime(bustime):
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"""Convert from bus time human-readable string [-]HH:MM[:SS[.fff]]
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to float seconds since bustime 00:00. Inverse of format_bustime(),
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see it for detail."""
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if bustime.startswith('-'):
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# parse without the -, then negate it
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return -parse_bustime(bustime[1:])
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parts = bustime.strip().split(':')
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if len(parts) == 2:
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hours, mins = parts
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secs = 0
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elif len(parts) == 3:
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hours, mins, secs = parts
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else:
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raise ValueError("Invalid bustime: must be HH:MM[:SS]")
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hours = int(hours)
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mins = int(mins)
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secs = float(secs)
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return 3600 * hours + 60 * mins + secs
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def format_bustime(bustime, round="millisecond"):
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"""Convert bustime to a human-readable string (-)HH:MM:SS.fff, with the
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ending cut off depending on the value of round:
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"millisecond": (default) Round to the nearest millisecond.
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"second": Round down to the current second.
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"minute": Round down to the current minute.
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Examples:
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00:00:00.000
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01:23:00
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110:50
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159:59:59.999
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-10:30:01.100
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Negative times are formatted as time-until-start, preceeded by a minus
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sign.
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eg. "-1:20:00" indicates the run begins in 80 minutes.
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"""
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sign = ''
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if bustime < 0:
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sign = '-'
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bustime = -bustime
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total_mins, secs = divmod(bustime, 60)
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hours, mins = divmod(total_mins, 60)
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parts = [
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"{:02d}".format(int(hours)),
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"{:02d}".format(int(mins)),
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]
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if round == "minute":
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pass
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elif round == "second":
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parts.append("{:02d}".format(int(secs)))
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elif round == "millisecond":
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parts.append("{:06.3f}".format(secs))
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else:
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raise ValueError("Bad rounding value: {!r}".format(round))
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return sign + ":".join(parts)
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def rename(old, new):
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"""Atomic rename that succeeds if the target already exists, since we're naming everything
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by hash anyway, so if the filepath already exists the file itself is already there.
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In this case, we delete the source file.
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"""
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try:
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os.rename(old, new)
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except OSError as e:
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if e.errno != errno.EEXIST:
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raise
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os.remove(old)
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def ensure_directory(path):
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"""Create directory that contains path, as well as any parent directories,
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if they don't already exist."""
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dir_path = os.path.dirname(path)
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if os.path.exists(dir_path):
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return
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ensure_directory(dir_path)
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try:
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os.mkdir(dir_path)
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except OSError as e:
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# Ignore if EEXISTS. This is needed to avoid a race if two getters run at once.
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if e.errno != errno.EEXIST:
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raise
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def jitter(interval):
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"""Apply some 'jitter' to an interval. This is a random +/- 10% change in order to
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smooth out patterns and prevent everything from retrying at the same time.
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"""
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return interval * (0.9 + 0.2 * random.random())
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def encode_strings(o):
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"""Recurvisely handles unicode in json output."""
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if isinstance(o, list):
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return [encode_strings(x) for x in o]
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if isinstance(o, dict):
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return {k.encode('utf-8'): encode_strings(v) for k, v in o.items()}
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if isinstance(o, unicode):
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return o.encode('utf-8')
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return o
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